not necessarily that we were using more health care services that drove that increase, is that right? >> that is correct. >> tom: so with that in mind, why, if demand hasn't moved, are prices moving higher? >> we really don't know why prices are going up. but they a going up rapidly. and when prices go up, total spending goes up. >> tom: you found, in fact, that the fastest spending increases were amongst the youngest patients, that seems counterintuitive, because usually we're spending more on heche as we get older and our bodies breakdown. >> yes, and this is of particular concern because if our expectations over the long run, bend that long run cost curve, if kids are at all ages more expensive, this is going to be very difficult. >> tom: so whatkind of speculation might you have about why the faster increase that we're seeing on spending with the youngest patients?